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Well I will start this by answering one part and work on the others. I believe they are able to communicate without words. Meaning with their thoughts they can hold council, just as they did after the darkening of Valinor when Feanor felt they were doing nothing.
I know it doesn't answer all, but again it's at least a start.
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“I wish it need not have happened in my time," said Frodo.
"So do I," said Gandalf, "and so do all who live to see such times. But that is not for them to decide. All we have to decide is what to do with the time that is given us.”
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